Lathe attachment



Dec. 16, 1952 c. GRACCHI LATHE ATTACHMENT Filed March 9, 1950 5 Sheets-Sheet l IN VEN TOR. CANO) DO GRAC C H l wmvess Dec. l6 1952 c. GRAccHl LATI-IE ATTACHMENT 5 Sheets-Sheet Filed March 9. 1950 gNVENToR. CANDIDO GRACCHI *BYQQ A WITNESS jam/@fw Dec. 16', 1952 c. GRAccHl INVENTOR. CANDIDO GRACCHI BY FIG. 4

Dec. 16, 1952 c. GRAccl-n 2,621,395

LATHE ATTACHMENT Filed March 9, 1950 5 Sheets-Sheet 4 -FIG.6

WITNESS INVENToR.

ACANDIDO GRACCHI My/** Y mwdq Dec. 16, 1952 c. -GRAccHI LATHE ATTACHMENT 5 Sheets-Sheet 5 Filed March 9, 1950 FIG. Il

Patented ec. 16, 1952 UNITED STATES PATENT OFFICE,

y 2,621,396 LATHE ATTACHMENT Candido Graechi, New York, N. Y.

Application March 9, 1950, Serial No. 148,618

"s claims. (o1. 29-49) This invention relates to lathe attachments.

More particularly stated, the invention relates to an attachment adapted for use on an engine lathe to convert the machine into the equivalent of a turret lathe, and also for use on a turret lathe to increase its usefulness and render it more eflicient.

On a production job it is often necessary to carry out multiple operations on each piece mounted in the lathe and to repeat such operations on successive pieces. this requires a tool setter to set the tool for eac operation.

'Ihis invention has for its salient object toV provide a lathe attachment so constructed and arranged that multiple operations can be carried out on each piece of work operated upon and thev operations carried out on all of the successive pieces will be identical.

Another object of the invention is to provide in a device of the type specified, means for quickly yand accurately adjusting the tool holder support on the base and for easily locking and un locking said support.

Further objects of the invention will appear from the following specification taken in connection with the drawings which form a part of this application, and in which Fig. 1 is a top plan view of a device constructed in accordance with the invention;

Fig. 2 is a vertical, sectional elevation taken substantially on line 2 2 of Fig. 1, looking in the direction of the arrows;

On the usual lathe Fig. 3 is a horizontal, sectional elevation taken Y substantially on line 3 3 of Fig. 2, looking in the direction of the arrows;

Fig. 4 is a vertical, sectional elevation, taken substantially on line 4--4 of Fig. 1, looking inthe direction of the arrows;

Fig. 5 is a vertical, sectional elevation, partly broken away, taken substantially on line 5-5 of Fig. 1, looking in the direction of the arrows;

Fig. 6 is a horizontal, sectional elevation taken substantially on line 6--6 of Fig. 5, looking in the direction of the arrows;

Fig. 7 is a vertical, sectional elevation, partly broken away, showing the lower end portion of the base block;

Fig. 8 is a sectional elevation showing one form of tool mounting in the tool holder;

Fig. 9 is a top plan View of one of the tool holders;

Fig. l0 is an end elevation of the tool holder shown in Fig. 9; and

Fig. 11 is a vertical, sectional elevation taken substantially on line of Fig. 1, looking in the direction of the arrows.

In the particular embodiment of the invention illustrated, the lathe attachment has a base block 3B which is ixedly secured to an engine lathe f carriage or a production lathe cross slide. The block 3|) has a recess in the bottom thereof, in which is secured the head 3| of a spindle 32 which extends upwardly and is threaded at 33 at its upper end. The head is secured to the base by bolts 34.

A tool holder block 35 is mounted on the base 3l) and on the spindle 32. The block 35 has a downwardly extending ange 35 which surrounds a reduced upper end 3l of the base and seats thereon.

The upper end surface of the base 3|)Y has a plurality of recesses 38 in which seat balls 39 mounted in upwardly extending bores 4|] in the block 35, the ball-s being pressed downwardly by springs 4| in the bores 40.

The upper surface of the base has a central recess 42 which registers with a recess 43 in the block 35 and receives a spring 44 which tends to separate the base 35 and block 35.

The tool holder block 35 is generally rectangular in shape and has four exactly similar outwardly facing sides A, B, C and D adapted to support tool holders 50.

Each side of the block 35 has at each corner beveled surfaces 5| and 52 engaged by beveled surfaces 53 and 5l of the tool holder. Each tool holder has also oppositely extending lugs 55 and 56 adapted for clamping engagement by the head 51 of a T-shaped clamping member or bolt 5S slidably mounted in the holder 35.

Each member or bolt 58 has a vertical bore 6U, in which is mounted a pin 6| having an eccentric portion 62 in the bore 6|?.

Each pin 6| has a collar 63 which rests on the upper surface of the block 35, and spaced above the collar is a ange 64 which is slabbed oli at 65. Above the Iiange 64 is a hex head 6B by which the pin is turned to lock orunlock the clamping head 5l from the tool holder.

The block 35, as shown in Fig. 11, has' bores 57 in which are inserted plugs 68, which lare held 1n place by screws 68'. The lower reduced end 69 of the plugs 58 seat in two of the recesses 38 in block 30. When the block is released and is ra1sed by the spring 44, the bottoms 69 of' the plugs 68 clear. the recesses and upper surface of the base and the block 35 can be rotated.

Eachtool holder may have a plurality of clamping bolts 10, as shown in Figs. 1 and 2, to clamp Each of the'tool'holders 59 is verticallyv adjustable on block 35 by a nut 'I8 which is threaded on a screw i9 threaded into and xed to the holder 50. Nut 18 has a flange f3 which rests on one of the anges E3. v

The particular feature claimed to ube novel in this application is the means for locking the tool holder block 35 and for rotating the block to-place the respective tools in position for operationen the work.

As shown particularly in Figs. 2, and 6, the spindle 32 has threaded on the end 33 thereof, aA sleeve 8S having a handle 8l extending outwardly therefrom. The sleeve 8d has a iiange 82 extending laterally over the ilanges 63 of pins 6 I, and the lower end 83 of the sleeve is disposed in an enlarged upper end of the bore in the block` 35. The end 83 has a plurality of longitudinal, upwardly extending grooves 84. A pawl or plunger 85 is slidably mounted in the block'35 and has a tooth 8S adapted to enter one of the grooves Bil and the plunger or pawl is pressed inwardly by a spring 8l. The sleeve 8G also has avshoulder 8S below the flange 82 adapted to engagethe upper surface of the block 35 when the sleeve Seis screwed down.

When the tool holders have been adjusted on the tool holder block to the desired position of adjustment, the desired tool holder can be moved to operative position with respect to thework by rotating the sleeve 88 and handle 8l in an anticlockwise direction, viewing Figs, l and 6. The

initial rotation of the sleeve releases the block- .t5

and the block is raised by spring 44, thusreleasing ends 69 of plugs B8 from recesses 38; Continued anti-clockwise rotation will, by engagement of the pawl or plunger tooth 8E with one-ofthe grooves 84, cause the rotation of theV toolY enter recesses 38 and lock the'tool-holder block 35 in adjusted position.

In the manner described, the desired tool and tool holder can be easily and quickly moved to operative position and locked therein.

Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.

What I claim is:

1. A lathe attachment comprising a base, a tool holder block mounted for rotation on the base,V

tool holder locking pins carried by the block, a spring between the block and base tending to separate the block from the base and tofraisethe block, a spindle secured to the base and extending upwardly through the base and tool holder block, a sleeve mounted on the spindle and extending above the block for rotation and longitudinal movement on the spindle, means on the sleeve and spindle adapted to raise the sleeve and release the block when the sleeve is rotated initially through a predetermined arc in anti-clockwise direction, interengaging means on the sleeve and block for causing subsequent anti-clockwise rotation of the sleeve to rotate the block', an annular shoulder on the sleeve adapted to engage the upper side of the block and lower and clamp the block when the sleeve is rotated in a clockwise direction, and an annular ange on the sleeve engageable with the locking pins when the block is in lowered position.

2. A lathe attachment comprising a base, a tool holder block mounted for rotation on the base, tool holder locking pins carried by the block, a spring between the block and base tending to separate the block from the base and to raise the block, a spindle secured to the base and extending upwardly through the base and tool holder block, a sleeve threaded on the spindle and extending above the block for rotation and longitudinal movement on the spindle, an annular shoulder on. the sleeve adapted to engage the upper side of the tool holder block and clamp the block when the sleeve is rotated in one direction, .Y an annular ange on the sleeve engageable with the lockingpins whenfth'ev block is in lowered position, and pawl and ratchet devices on the'- sleeve and block normally inactive during initial anti-clockwise rotation of the sleeve vfor releasing 1 the block, said pawl and ratchet devices becoming active upon continued anti-clockwise rotation of the sleeve for rotating the block with the sleeve:

vertical pins for clamping the tool holders to the' block, plugs in the block extending through the bottom of the block, recesses in the base top forv receiving the lower ends of said plugs, a spindle secured to the base and extending upwardly through the block, a sleeve threaded on the upper end of the spindle, a ratchet and pawl connection between the sleeve and block, an annular shoulder on the sleeve engageable with the upper side of the block when the sleeve is rotated in a clockwise direction to clamp the block tothe base, an annular ange on the sleeve above the shoulder engageable with the vertical pins when the block is in lowered position, initial anti-clockwise rotation of the sleeve releasing the block and permitting the block to rise and releasing the plug ends from the base recesses and continual anticlockwise rotation of the sleeve rendering the pawl and ratchet connection operative for rotating the block with the sleeve.

CANDIDO GRACCHI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 466,646 Woodruff Jan. 5, 1892 852,943 Gehris May 7, 1907 2,366,050 Peterson et al Dec. 26,1944 

